On Thu, Sep 22, 2011 at 10:11:06AM -0700, Simon Glass wrote:
> This simple utility allows writing of values into a device tree from the
> command line. It aimes to be the opposite of fdtget.
>
> What is it for:
> - Updating fdt values when a binary blob already exists
> (even though source may be available it might be easier to use this
> utility rather than sed, etc.)
> - Writing machine-specific fdt values within a build system
>
> To use it, specify the fdt binary file on command line followed by the node
> and property to set. Then, provide a list of values to put into that
> property. Often there will be just one, but fdtput also supports arrays and
> string lists.
>
> fdtput does not try to guess the type of the property based on looking at
> the arguments. Instead it always assumes that an integer is provided. To
> indicate that you want to write a string, use -ts. You can also provide
> hex values with -tx.
>
> The command line arguments are joined together into a single value. For
> strings, a nul terminator is placed between each string when it is packed
> into the property. To avoid this, pass the string as a single argument.
>
> Usage:
> fdtput <options> <dt file> <<node> <property> [<value>...]
> Options:
> -t <type> Type of data
> -v Verbose: display each value decoded from command line
> -h Print this help
>
> <type> s=string, i=int, u=unsigned, x=hex
> Optional modifier prefix:
> hh or b=byte, h=2 byte, l=4 byte (default)
>
> To read from stdin and write to stdout, use - as the file. So you can do:
>
> cat somefile.dtb | fdtput -ts - /node prop "My string value" > newfile.dtb
>
> This commit also adds basic tests to verify the major features.
>
> Signed-off-by: Simon Glass <s...@chromium.org>
Acked-by: David Gibson <da...@gibson.dropbear.id.au>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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